calcs/hazard/classical/__init__:
calcs/hazard/classical/__init__:

Expanded the documentation about the calculating the number of total
hazard curves (added the R factor: number of logic tree realizations).


Former-commit-id: b9ae8d8d5f43cd544102b00b55085b5578987966 [formerly cc9e1eb6eba2014347b73718a62643e12684734c]
Former-commit-id: b548c239312b210836a06a8c6d738837dddfb8f7
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine